#pragma once

#include <assert.h>
#include <iostream>
using namespace std;
namespace bit
{
	class string
	{
	public:
		typedef char* iterator;
		typedef const char* const_iterator;

		iterator begin();
		iterator end();

		const_iterator begin() const;
		const_iterator end() const;

		string(const char* str = "");
		string(const string& s);
		string& operator=(const string& s);
		~string();

		const char* c_str() const;

		size_t size() const;
		char& operator[](size_t pos);
		const char& operator[](size_t pos) const;

		void reserve(size_t n);

		void push_back(char ch);
		void append(const char* str);

		string& operator+=(char ch);
		string& operator+=(const char* str);

		void insert(size_t pos, char ch);
		void insert(size_t pos, const char* str);
		void erase(size_t pos = 0, size_t len = npos);

		size_t find(const char ch, size_t pos = 0);
		size_t find(const char* str,size_t pos = 0);

		void swap(string& s);
		string substr(size_t pos = 0, size_t len = npos);

		void clear();

	private:
		char* _str;
		size_t _capacity;
		size_t _size;

		static const  size_t npos;
	};


	istream& operator>> (istream& is, string& str);
	ostream& operator<< (ostream& os, const string& str);
}

